Burglar-alarm



(No Model.)

C. H. WRIGHT.

BURGLAR ALARM.

Patented Mar. 6, 1888.

N. ruins, whmumognpher. wmmngean. uA a UNITED STATES PATENT OFFICE.

CHARLES I-I. WRIGHT, OF CHICAGO, ILLINOIS.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 379,144, dated March 6, 1888.

Application filed November 15, 1887. Serial No. 255,231.

To all whom it may concern.-

Be it known that I, CHARLES H. WRIGHT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Burglar-Alarms, of which the following is a specification.

My invention relates tothe class of electric burglar-alarms; and it relates more particularly to the improved means I employ for setting the device to adapt the alarm mechanism to be actuated by the movement from its position of a barrier-such asa windowto access into a room or other inclosure.

My invention has for its object the attainment of absolute effectiveness and reliability in its operation and simplicity of construction.

From the description hereinafter contained it will be quite evident that my improved device may be operatively applied to various forms of barriers-as doors, windows, drawers, and the like-and I do not, therefore, limit myself to any particular connection for it; but for the sake of convenience I confine the following description to its application in connection with a window, and so illustrate it in the accompanying` drawings, in which- Figure l shows a window in verticallytransverse sectional elevation partly broken and provided with my improvement, showing` the switch-linger by full lines in its position to be operated by raising the lower window-sash, and by dotted lines, respectively, in the position to close the circuit, to which position it is brought by raising the sash, and in the position to which it is moved when it is desired to maintain the device inactive; and Fig. 2, a section taken on the line 2 2 of Fig. l, viewed in the direction of the arrows, and enlarged.

A is the inside stop, B the parting-strip,and C the outside stop, of a window-casing.

D is the lower sash, adapted,as usual, to slide between the stop A and partingstrip, and E the upper sash between the parting-strip and outside stop.

On the stop A, near the upper end of the lower sash, D, when the latter is down, are provided two contactpoints,1n and p, one above the other, forming, through conductors q and g', the terminals of a battery, F, or other form of generator, which maybelocated in any suit- (No model.)

able position, and in the battery-circuit is a vibrating bell, G, or any other suitable sounder or alarm producing device, which will be caused to operate by the effect upon thc circuit of raising the lower window-sash.

H is a dat metallicfinger hinged or pivoted to the lower contact-point, r, and adapted to be turned upon its support to extend,as shown, edgewise across the path of the lower sash, D, or into contact with Ythe end of upper contactpoint, p, or to be turned on its pivot past or beyond the latter, each of the two latter positions being indicated by dotted lines. The first of the three positions referred to is that at which the device is seu It will be noticed that the contact-points r and p are in such position with relation to each other, the switch-finger, and. sash D that when the latter is raised, while the' finger H is in its path, it will turn the finger into contact toward its upper end with the end of the contact-point p, thereby closing the circuit and causing the alarm to act. When it is not desired to have the device set-that is,when it is desired that the alarm shall not be operative by raising the Window-sash D-the finger H may be turned on the contact-point r from the contact-point p, over the end of which it slides past the latter in a direction away from the path of the lower sash.

The device forming my improvement may readily be adapted by those skilled in the art to which it relates and without description or illustration in the present connection, to upper window-sashes, doors, drawers, and the like, to perform its function in a manner the same or substantially the same as in the connection herein shown and described; and I therefore wish it to be understood that I intend it for any such application and include the same as within the spirit of my invention.

When once placed in position,though readily removable, the device need never be disturbed for repair, as its simplicity of construction precludes the probability of impairment with use other than perhaps corrosion of the contacts or the accumulation upon them of matter that would interfere with the operation,which may, however, be readily remedied Without removing the parts.

While it is intended that the alarm shall be IOO sounded by the closing,` of the circuit in the manner described through the medium of the finger H, obviously the arrangement and nature of the device could be such as to acl nate the alarm by opening thecircnit.

NVhat I clai 1n as new, and. desire to secure by Letters Patent, is

ln an electric l'mrglar-alarnl, the combination, with the generator, alarm mechanism, and window, or the like, of two contacts, r and 1), forming` the terminals of the generator and located at one side of the window or the like, and beyond the actuating-edge thereof, when the latter is shut, and a switch-linger, H, pivotally connected with one of the said contacts and extending to close the ci1cnit,with its free CHARLES H. VRIGHT.

In presence of- J. W. DYRnNFoRTl-I, Gillis. E. GAYLoRD. 

